Direct current motor with double layer armature windings

Abstract

A direct current motor having armature windings which are superposed on each other in double layers. The motor includes a fixed field magnet having 2mn poles (m being a positive integer of 1 or more, n being a positive integer of 2 or more) which are magnetized alternately to N and S polarities in equal angular spaces, a magnetic material member for closing the magnetic path of the field magnet, a rotating shaft supported by bearings provided in the housing of motor, and an armature which is secured to the shaft for rotation in the magnetic path and facing the field magnet poles. A first series of m(2n+1) armature windings are mounted on the armature and are juxtaposed with respect to each other at equal pitches, the angular spacing between the conductor portions, which contribute to generate torque, of the armature winding being equal to the angular width of the field magnet pole. A second series of m(2n+1) armature windings are also mounted on the armature and are juxtaposed with respect to each other at equal pitches, the angular spacing between the conductor portions, which contribute to generate torque, of the armature winding of the second series also being equal to the angular width of the field magnet pole. The first series of the m(2n+1) armature windings and the second series of the m(2n+1) armature windings are superposed on each other and are disposed, with respect to each other, out of phase by 1/(2n-1) of the angular width of the field magnet pole.

What is claimed is: 
     
       1. A direct current motor having armature windings superposed on each other in double layers comprising: a fixed field magnet having two poles which are magnetized respectively to N and S polarities at equal angular spaces; a magnetic material member for closing the magnetic path of said field magnet; a rotating shaft supported by bearing means provided in a housing of said motor; an armature fixed to said shaft and adapted to rotate in said magnetic path facing said field magnet poles; a first series of three armature windings mounted on said armature, said armature windings of said first series being juxtaposed with respect to each other at equal pitches, the angular spacing between conductor portions of each of said windings being equal to the angular width of each said field magnet pole; and a second series of three armature windings mounted on said armature, said armature windings of said second series juxtaposed with respect to each other at equal pitches, the angular spacing between conductor portions of each of said armature windings of said second series being equal to the angular width of each said field magnet pole; said first series of the three armature windings and said second series of the three armature windings being superposed on each other with a 60° phase shift therebetween. 
     
     
       2. A direct current motor according to claim 1 wherein terminals of said armature windings of said first and second series are connected respectively to corresponding ones of six commutator segments, said motor further including brushes which are adapted to receive current from a positive and negative terminals of a supply source and to slidingly contact with said commutator segments, the angular spacing between said brushes being 180°. 
     
     
       3. A direct current motor having armature windings superposed on each other in double layers comprising: a fixed field magnet having 2mn poles which are magnetized alternately to N and S polarities at equal angular spaces, wherein m is a positive integer of 1 or more and n is a positive integer of 2 or more; a magnetic material member for closing the magnetic path of said field magnet; a rotating shaft supported by bearing means provided in a housing of said motor; an armature fixed to said shaft and adapted to rotate in said magnetic path facing said field magnet poles; a first series of m(2n+1) armature windings mounted on said armature, said armature windings of said first series being juxtaposed with respect to each other at equal pitches, the angular spacing between conductor portions of each of said armature windings being equal to the angular width of each said field magnet pole; and a second series of m(2n+1) armature windings, said armature windings of said second series being juxtaposed with respect to each other at equal pitches, the angular spacing between conductor portions of each of said armature windings of said second series being equal to the angular width of each said field magnet pole; said first series of the m(2n+1) armature windings and said second series of the m(2n+1) armature windings being superposed on each other with a phase shift with respect to each other of 1/(2n+1) of the angular width of each said field magnet pole. 
     
     
       4. A direct current motor according to claim 3 wherein terminals of said armature windings of said first and second series are connected respectively to corresponding ones of 2mn(2n+1) commutator segments, said commutator segments being interconnected in common mn by mn, said motor further including brushes which are adapted to receive current from a positive and a negative terminals of a supply source and to slidingly contact with ones of said armature segments, the angular spacing between said brushes being equal to the angular spacing between said ones of the commutator segments which is 360°/2mn or equal to the angular spacing between the commutator segments which are interconnected in common respectively with said ones of the commutator segments.